Exploited in the wild, CISA KEV entry, high-severity RCE in a widely deployed Nextcloud/Collabora integration — impacts many orgs using built-in CODE Server.
CVE-2026-110447
OS command injection in Collabora Online built-in CODE Server allows remote code execution when CODE server is down.
Is CVE-2026-110447 being exploited?
Yes. CVE-2026-110447 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2026-110447?
CVE-2026-110447 is rated Critical with a CVSS score of 9.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-110447?
Yes. A fix has been recorded for CVE-2026-110447. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-110447 affect?
CVE-2026-110447 affects Collabora Online built-in CODE Server (richdocumentscode) < 26.4.303, Nextcloud deployments using built-in CODE Server (not standalone Collabora servers). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-110447?
Update to >=26.4.303 or apply vendor mitigations; isolate/expose servers pending patch.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
OS command injection via proxy.php when built-in CODE server isn't running; allows attackers to run arbitrary OS commands and achieve remote code execution as app user.
Immediate action required
- affected< 26.4.303
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.